<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视区 -->
    <el-card>
      <!-- 添加按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolesList" :border="true" :stripe="true">
        <!-- 展开列 -->
        <el-table-column type="expand" label="展开">
          <template v-slot="{ row }">
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(row, item1.id)">{{
                  item1.authName
                }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环 嵌套渲染二级循环 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <!-- 二级权限 -->
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(row, item2.id)"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(row, item3.id)"
                      >{{ item3.authName }}</el-tag
                    >
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column label="#" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template v-slot="{ row }">
            <el-button size="mini" type="primary" icon="el-icon-edit"
              >编辑</el-button
            >
            <el-button size="mini" type="danger" icon="el-icon-delete"
              >删除</el-button
            >
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defaultKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Roles",
  data() {
    return {
      //所有角色数据
      rolesList: [],
      //控制分配权限对话框的显示
      setRightDialogVisible: false,
      //获取所有的权限数据
      rightList: [],
      //树形控件的属性绑定对象
      treeProps: {
        label: "authName",
        children: "children",
      },
      //默认选中的节点ID数组
      defaultKeys: [],
      //当前即将分配权限的角色id
      roleId:'',
    };
  },
  created() {
    this.getRolesList();
  },
  //获取所有角色数据
  methods: {
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取角色数据失败");
      } else {
        this.rolesList = res.data;
      }
    },
    //根据ID删除相应的权限
    async removeRightById(role, rightId) {
      //弹窗提示用户是否要删除
      const confirmResult = await this.$confirm(
        "此操作将永久删除该权限, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("取消了删除权限");
      } else {
        const { data: res } = await this.$http.delete(
          `roles/${role.id}/rights/${rightId}`
        );
        if (res.meta.status !== 200) {
          return this.$message.error("删除权限失败");
        } else {
          role.children = res.data;
        }
      }
    },
    //展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id;
      //获取所有权限的数据
      const { data: res } = await this.$http.get("rights/tree");
      if (res.meta.status !== 200) {
        return this.$message.error("获取权限数据失败");
      } else {
        //把获取到的数据保存到rightList中
        this.rightList = res.data;

        //递归获取三级节点的id
        this.getLeafKeys(role, this.defaultKeys);
      }
      this.setRightDialogVisible = true;
    },
    //通过递归的形式，获取角色下所有三级权限的id，并保存到defaultKeys数组中
    getLeafKeys(node, arr) {
      //如果当前node节点不包含children属性，则是三级节点。
      if (!node.children) {
        return arr.push(node.id);
      } else {
        node.children.forEach((item) => this.getLeafKeys(item, arr));
      }
    },
    //监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defaultKeys = [];
    },
    //点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ];
      const idStr = keys.join(',');

      const {data:res} =await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr});
      if(res.meta.status !==200) {
        return this.$message.error('分配权限失败');
      }else{
        this.$message.success('分配权限成功');
        this.getRolesList();
        this.setRightDialogVisible = false;
      }
    },
  },
};
</script>

<style scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
/* 权限图标纵向上居中对齐 */
.vcenter {
  display: flex;
  align-items: center;
}
</style>